Python | Toggle button in kivy using .kv file

Kivy is a platform independent GUI tool in Python. As it can be run on Android, IOS, linux and Windows etc. It is basically used to develop the Android application, but it does not mean that it can not be used on Desktops applications.

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Toggle button:

The ToggleButton widget acts like a checkbox. When you touch or click it, the state toggles between ‘normal’ and ‘down’ (as opposed to a Button that is only ‘down’ as long as it is pressed).
Toggle buttons can also be grouped to make radio buttons – only one button in a group can be in a ‘down’ state. The group name can be a string or any other hashable Python object:

btn1 = ToggleButton(text='Male', group='sex', )
btn2 = ToggleButton(text='Female', group='sex', state='down')
btn3 = ToggleButton(text='Mixed', group='sex')

Only one of the buttons can be ‘down’/checked at the same time. To configure the ToggleButton, you can use the same properties that you can use for a Button class.

Basic Approach:

1) import kivy
2) import kivyApp
3) import toggle button
4) import Gridlayout
5) Set minimum version(optional)
6) create layout class
7) create App class
8) create the, kv file
9) return Layout/widget/Class(according to requirement)
10) Run an instance of the class

Implementation of the Approach:
.py code:

Python3

# Program to explain how to use Toggle button in kivy

# import kivy module
import kivy

# base Class of your App inherits from the App class.
# app:always refers to the instance of your application
from kivy.app import App

# this restrict the kivy version i.e
# below this kivy version you cannot
# use the app or software
kivy.require('1.9.0')

# The ToggleButton widget acts like a checkbox.
# To use this you must have to import it.
from kivy.uix.togglebutton import ToggleButton

# The GridLayout arranges children in a matrix.
# It takes the available space and divides it
# into columns and rows, then adds
# widgets to the resulting “cells”.
from kivy.uix.gridlayout import GridLayout


# Create the Layout Class
class Toggle_btn(GridLayout):
    pass

# Create the App Class
class ToggleApp(App):
    def build(self):
        return Toggle_btn()

# Run the App
if __name__=='__main__':
   ToggleApp().run()

.kv code:

Python3

# .kv file implementation of the code

<Toggle_btn>:

    # Columns divides screen in two parts
    cols:2

    # Create Toggle button 1
    RelativeLayout:
        canvas:
            Color:
                rgb: 0, 0, 1
            Rectangle:
                size: root.width, root.height
        ToggleButton:
            size_hint: None, None
            size: 0.25 * root.width, 0.25 * root.height
            pos: 0.125 * root.width, 0.350 * root.height
            text: 'Toggle Button 1'
            group: 'geometry'

   # Create Toggle button 2
    RelativeLayout:
        canvas:
            Color:
                rgb: 0, 1, 1
            Rectangle:
                size: root.width, root.height
        ToggleButton:
            size_hint: None, None
            size: 0.25 * root.width, 0.25 * root.height
            pos: 0.125 * root.width, 0.350 * root.height
            text: 'Toggle Button 2'
            group: 'geometry'

Output: